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title="壓敏電阻測試儀">壓敏電阻測試儀</a></li> </div> </ul> </ul> </div> <div id="5hlvxzllpl3" class="page-right"> <div id="5hlvxzllpl3" class="onurl"> <a href="/"><img src="/Skins/333987/images/home.png"></a><a href="/">網(wǎng)站首頁</a>><a href="/article.html">技術(shù)文章</a> > QJ44直流雙臂電橋性能使用</div> <div id="5hlvxzllpl3" class="page-news"> <div id="5hlvxzllpl3" class="newshowheader"> <h1 class="nd_title">QJ44直流雙臂電橋性能使用</h1> <div id="5hlvxzllpl3" class="article-info"> <span> 瀏覽：</span> 1220<span id="5hlvxzllpl3" class="split">|</span> <span id="publishtime">更新時間：2018-10-20</span> <span id="5hlvxzllpl3" class="split">|</span> </div> </div> <div id="5hlvxzllpl3" class="page-newshow"> <p style="margin-right: 0pt; margin-left: 8.95pt;"><span style="font-size:12pt"><span style="font-family:宋體">QJ44型攜帶式直流雙臂電橋，內(nèi)附晶體管檢流計和能內(nèi)附工作電源。適合于工礦企業(yè)、實驗室或車間現(xiàn)場，對直流以低值電阻作準(zhǔn)確測量。如用來測量金屬導(dǎo)體的導(dǎo)電系數(shù)，接觸電阻、電動機、變壓器繞組的電阻值，以及其它各類直流低值電阻。</span></span></p><p style="margin-right: 0pt; margin-left: 0pt;"><span style="font-size:12pt"><span style="font-family:宋體">二、電橋主要性能</span></span></p><p style="margin-right: 0pt; margin-left: 17.95pt;"><span style="font-size:12pt"><span style="font-family:宋體">1、準(zhǔn)確度等級：0.2級。</span></span></p><p style="margin-right: 0pt; margin-left: 0pt;"><span style="font-size:12pt"><span style="font-family:宋體">2、使用溫度范圍：5℃～45℃。</span></span></p><p style="margin-right: 0pt; margin-left: 0pt;"><span style="font-size:12pt"><span style="font-family:宋體">3、測量范圍：0.00001～11Ω，基本量限0.01～11Ω。</span></span></p><p style="margin-right: 0pt; margin-left: 8.95pt;"><span style="font-size:12pt"><span style="font-family:宋體">4、準(zhǔn)確度：電橋在環(huán)境溫度為20℃±10℃，相對濕度小于80%的條件下，在基本量限內(nèi)，允許測量誤差為：</span></span></p><p style="margin-right: 0pt; margin-left: 8.95pt;"><span style="font-size:12pt"><span style="font-family:宋體">?△?≤а% Rmax（允許誤差為滑線讀數(shù)刻度4小格）。</span></span></p><p style="margin-right: 0pt; margin-left: 0pt;"><span style="font-size:12pt"><span style="font-family:宋體">а…………………………………準(zhǔn)確度等級（0.2級）</span></span></p><p style="margin-right: 0pt; margin-left: 0pt;"><span style="font-size:12pt"><span style="font-family:宋體">Rmax…………………………電橋讀數(shù)的滿刻度（Ω）</span></span></p><p style="margin-right: 0pt; margin-left: 8.95pt;"><span style="font-size:12pt"><span style="font-family:宋體">5、內(nèi)附晶體管檢流計，具有足夠的靈敏度。在基本量限內(nèi)，當(dāng)滑線讀數(shù)盤刻度變化4小格，檢流計指針偏離零位不小于1格。</span></span></p><p style="margin-right: 0pt; margin-left: 8.95pt;"><span style="font-size:12pt"><span style="font-family:宋體">6、電橋的工作電源為1.5V～2V（內(nèi)附電源為1.5V1號手電筒電池4節(jié)并聯(lián)），晶體管檢流計工作電源為6F22、9V（2節(jié)并聯(lián)）。</span></span></p><p style="margin-right: 0pt; margin-left: 0pt;"><span style="font-size:12pt"><span style="font-family:宋體">7、儀器外形尺寸：300×255×15</span></span><span style="font-size:12pt"><span style="font-family:宋體">0mm</span></span><span style="font-size:12pt"><span style="font-family:宋體">。</span></span></p><p style="margin-right: 0pt; margin-left: 0pt;"><span style="font-size:12pt"><span style="font-family:宋體">8、儀器重量：約4.5Kg。</span></span></p><p style="margin-right: 0pt; margin-left: 0pt;"><span style="font-size:12pt"><span style="font-family:宋體">三、線路和和結(jié)構(gòu)</span></span></p><p style="margin-right: 0pt; margin-left: 24.05pt;"><span style="font-size:12pt"><span style="font-family:宋體">1、QJ44雙臂電橋面板位置圖</span></span></p><p style="margin-right: 0pt; margin-left: 0pt;"> <img alt="" data-bd-imgshare-binded="1" src="http://img57.chem17.com/9/20171115/636463308189388725301.png" style="height:243px; width:301px" /></p><p style="margin-right: 0pt; margin-left: 0pt;"><span style="font-size:12pt"><span style="font-family:宋體">(1) 電橋外接工作電源接線柱 (2) 檢流計靈敏度調(diào)節(jié)旋鈕；</span></span></p><p style="margin-right: 0pt; margin-left: 0pt;"><span style="font-size:12pt"><span style="font-family:宋體">(3) 晶體管檢流計工作電源開關(guān) (4) 滑線讀數(shù)盤；</span></span></p><p style="margin-right: 0pt; margin-left: 0pt;"><span style="font-size:12pt"><span style="font-family:宋體">(5) 步進讀數(shù)開關(guān) (6) 檢流計按鈕開關(guān)；</span></span></p><p style="margin-right: 0pt; margin-left: 0pt;"><span style="font-size:12pt"><span style="font-family:宋體">(7) 電橋工作電源按鈕開關(guān) (8) 被測電阻電流端接線柱 </span></span></p><p style="margin-right: 0pt; margin-left: 0pt;"><span style="font-size:12pt"><span style="font-family:宋體">(9) 量程因素讀數(shù)開關(guān) (10) 被測電阻電位端接線柱</span></span></p><p style="margin-right: 0pt; margin-left: 0pt;"><span style="font-size:12pt"><span style="font-family:宋體">(11) 檢流計電氣調(diào)零旋鈕 (12) 被測電阻電流端接線柱</span></span></p><p style="margin-right: 0pt; margin-left: 0pt;"><span style="font-size:12pt"><span style="font-family:宋體">(13) 檢流計指示表頭</span></span></p><p style="margin-right: 0pt; margin-left: 0pt;"><span style="font-size:12pt"><span style="font-family:宋體">2、電橋線路： </span></span></p><p style="margin-right: 0pt; margin-left: 0pt;"> <img alt="" data-bd-imgshare-binded="1" src="http://img58.chem17.com/9/20171115/636463308431189150483.png" style="height:289px; width:383px" /></p><p style="margin-right: 0pt; margin-left: 0pt;"><span style="font-size:12pt"><span style="font-family:宋體">四、使用方法</span></span></p><p style="margin-right: 0pt; margin-left: 0pt;"><span style="font-size:12pt"><span style="font-family:宋體">1、在電池盒內(nèi)，裝入1.5V1號手電筒電池4~6節(jié)并聯(lián)使用和2節(jié)6F22、9V并聯(lián)使用，此時電橋就能正常工作。如用外接直流電源1.5~2V時，電池盒內(nèi)的1.5V電池，應(yīng)預(yù)先全部取出。</span></span></p><p style="margin-right: 0pt; margin-left: 0pt;"><span style="font-size:12pt"><span style="font-family:宋體">2、“B</span></span><sub><span style="font-size:12pt"><span style="font-family:宋體">1</span></span></sub><span style="font-size:12pt"><span style="font-family:宋體">”開關(guān)扳到通位置，等穩(wěn)定后（約5分鐘），調(diào)節(jié)檢流計指針在零位。</span></span></p><p style="margin-right: 0pt; margin-left: 0pt;"><span style="font-size:12pt"><span style="font-family:宋體">3、靈敏度旋鈕放在zui低位置。</span></span></p><p style="margin-right: 0pt; margin-left: 0pt;"><span style="font-size:12pt"><span style="font-family:宋體">4、將被測電阻，按四端連接法，接在電橋相應(yīng)的C</span></span><sub><span style="font-size:12pt"><span style="font-family:宋體">1</span></span></sub><span style="font-size:12pt"><span style="font-family:宋體">、P</span></span><sub><span style="font-size:12pt"><span style="font-family:宋體">1</span></span></sub><span style="font-size:12pt"><span style="font-family:宋體">、P</span></span><sub><span style="font-size:12pt"><span style="font-family:宋體">2</span></span></sub><span style="font-size:12pt"><span style="font-family:宋體">、C</span></span><sub><span style="font-size:12pt"><span style="font-family:宋體">2</span></span></sub><span style="font-size:12pt"><span style="font-family:宋體">、的接線柱上。如下圖所示，AB之間為被測電阻。</span></span></p><p style="margin-right: 0pt; margin-left: 31.5pt;"> <img alt="" data-bd-imgshare-binded="1" src="http://img64.chem17.com/9/20171115/636463308740381693972.png" style="height:103px; width:261px" /></p><p style="margin-right: 0pt; margin-left: 0pt;"><span style="font-size:12pt"><span style="font-family:宋體">5、估計被測電阻值大小，選擇適當(dāng)倍率位置，先按“G”按鈕，再按“B”按鈕，調(diào)節(jié)步進讀數(shù)和滑線讀數(shù)，使檢流計指針在零位上。如發(fā)現(xiàn)檢流計靈敏度不夠，應(yīng)增加其靈敏度，移動滑線盤4小格，檢流計指針偏離零位約1格，就能滿足測量要求。在改變靈敏度時，會引起檢流計指針偏離零位，在測量之前，隨時都可以調(diào)節(jié)檢流計零位。被測電阻按下式計算：</span></span></p><p style="margin-right: 0pt; margin-left: 0pt;"><span style="font-size:12pt"><span style="font-family:宋體">被測電阻值=倍率讀數(shù)×（步進讀數(shù)+滑線讀數(shù)）</span></span></p><p style="margin-right: 0pt; margin-left: 0pt;"><span style="font-size:12pt"><span style="font-family:宋體">被測電阻范圍與倍率位置選擇按下表：</span></span></p><table style="border-collapse:collapse; margin-left:60.6pt; width:444px"><tbody><tr><td style="width: 192px;"><p style="text-align: center; margin-right: 0pt; margin-left: 0pt;"><span style="font-size:12pt"><span style="font-family:宋體">倍率</span></span></p></td><td style="width: 252px;"><p style="text-align: center; margin-right: 0pt; margin-left: 0pt;"><span style="font-size:12pt"><span style="font-family:宋體">被測電阻范圍（Ω）</span></span></p></td></tr><tr><td style="width: 192px;"><p style="text-align: center; margin-right: 0pt; margin-left: 0pt;"><span style="font-size:12pt"><span style="font-family:宋體">×100</span></span></p></td><td style="width: 252px;"><p style="text-align: center; margin-right: 0pt; margin-left: 0pt;"><span style="font-size:12pt"><span style="font-family:宋體">1.1~11</span></span></p></td></tr><tr><td style="width: 192px;"><p style="text-align: center; margin-right: 0pt; margin-left: 0pt;"><span style="font-size:12pt"><span style="font-family:宋體">×10</span></span></p></td><td style="width: 252px;"><p style="text-align: center; margin-right: 0pt; margin-left: 0pt;"><span style="font-size:12pt"><span style="font-family:宋體">0.11~1.1</span></span></p></td></tr><tr><td style="width: 192px;"><p style="text-align: center; margin-right: 0pt; margin-left: 0pt;"><span style="font-size:12pt"><span style="font-family:宋體">×1</span></span></p></td><td style="width: 252px;"><p style="text-align: center; margin-right: 0pt; margin-left: 0pt;"><span style="font-size:12pt"><span style="font-family:宋體">0.011~0.11</span></span></p></td></tr><tr><td style="width: 192px;"><p style="text-align: center; margin-right: 0pt; margin-left: 0pt;"><span style="font-size:12pt"><span style="font-family:宋體">×0.1</span></span></p></td><td style="width: 252px;"><p style="text-align: center; margin-right: 0pt; margin-left: 0pt;"><span style="font-size:12pt"><span style="font-family:宋體">0.0011~0.011</span></span></p></td></tr><tr><td style="width: 192px;"><p style="text-align: center; margin-right: 0pt; margin-left: 0pt;"><span style="font-size:12pt"><span style="font-family:宋體">×0.01</span></span></p></td><td style="width: 252px;"><p style="text-align: center; margin-right: 0pt; margin-left: 0pt;"><span style="font-size:12pt"><span style="font-family:宋體">0.00001~0.0011</span></span></p></td></tr></tbody></table><p style="margin-right: 0pt; margin-left: 0pt;"><span style="font-size:12pt"><span style="font-family:宋體">QJ44型晶體管檢流計簡易修理</span></span></p><p style="margin-right: 0pt; margin-left: 0pt;"><span style="font-size:12pt"><span style="font-family:宋體">晶體管檢流計常見故障有以下幾種：不工作、靈敏度低、調(diào)零調(diào)不到零等等。如果有條件，可以用示波器、毫伏表、訊號發(fā)生器等電子儀器來檢查故障。在這里我們只介紹簡易的檢修方法，供在修理時參考。</span></span></p><p style="margin-right: 0pt; margin-left: 0pt;"><span style="font-size:12pt"><span style="font-family:宋體">一、對分法</span></span></p><p style="margin-right: 0pt; margin-left: 0pt;"><span style="font-size:12pt"><span style="font-family:宋體">在修理時，有些同志感到無從下手，或是無目的地焊這拆那，往往故障未查出，反把好的元件弄壞。用對分法檢查故障，即能避免全</span></span></p><p style="margin-right: 0pt; margin-left: 0pt;"><span style="font-size:12pt"><span style="font-family:宋體">面檢查而浪費時間，又能不至無故損壞元件。所謂對分法，即在故障范圍中，選擇一點進行檢查，判別故障發(fā)生在此點前，還是在此點后，這樣就能肯定一半，然后在剩下的故障范圍內(nèi)，再找一點進行檢查，按此方法檢查下去，就會很快地找到故障所在點。</span></span></p><p style="margin-right: 0pt; margin-left: 0pt;"><span style="font-size:12pt"><span style="font-family:宋體">1、例如在電源、表頭和訊號輸入均*的情況下；晶體管檢流計不工作。用對分法來檢查故障，在圖1中，選擇(5)點作為檢查點，調(diào)節(jié)W，如果表頭指針相應(yīng)會偏轉(zhuǎn)，則來自振蕩器的訊號能從(6)點（BG</span></span><sub><span style="font-size:12pt"><span style="font-family:宋體">3</span></span></sub><span style="font-size:12pt"><span style="font-family:宋體">發(fā)射極）輸入而進行放大、解調(diào)，可見振蕩器，解調(diào)器的工作正常。而交流放大器是一個整體，BG</span></span><sub><span style="font-size:12pt"><span style="font-family:宋體">2</span></span></sub><span style="font-size:12pt"><span style="font-family:宋體">—BG</span></span><sub><span style="font-size:12pt"><span style="font-family:宋體">5</span></span></sub><span style="font-size:12pt"><span style="font-family:宋體">也不會有問題。顯然故障一下就縮小到調(diào)制器所屬范圍內(nèi)。</span></span></p><p style="margin-right: 0pt; margin-left: 0pt;"><span style="font-size:12pt"><span style="font-family:宋體">2、如果調(diào)節(jié)W，表頭指針無反應(yīng)，或反應(yīng)不明顯，則問題在調(diào)制以外的回路中，再選(4)點，解調(diào)器輸入端，用一導(dǎo)線，一頭接觸(4)點，另一頭分別與(7)和(8)兩點相接觸，如果表頭指針相應(yīng)打向兩邊，則解調(diào)器和振蕩器工作正常，故障發(fā)生在交流放大器內(nèi)。</span></span></p><p style="margin-right: 0pt; margin-left: 0pt;"><span style="font-size:12pt"><span style="font-family:宋體">3、在剩下的振蕩器和解調(diào)器中選擇(9)和(10)兩點，用萬用表交流電壓檔測量以上兩對地之間的交流電壓，若分別約1V和1.5V，表明振蕩器工作正常。zui后只需檢查解調(diào)器就是了。檢查解調(diào)器除了檢查電路是否有假焊外，主要判別場效應(yīng)管是否損壞。也可檢查(7)和(8)兩點對地電壓，用萬用表測量時，須串接一個5μF以上電容。如果兩點對地電壓很低，或其中一點不正常，則振蕩器可能正常，而調(diào)制或解調(diào)中場效應(yīng)管柵極嚴(yán)重漏電。如果(7)和(8)兩點對地?zé)o電壓，再用直流電壓表測(7)和(8)對地直流電壓，就可查出故障點。</span></span></p><p style="margin-right: 0pt; margin-left: 0pt;"><span style="font-size:12pt"><span style="font-family:宋體">二、也可以用訊號注入法檢查晶體管檢流計</span></span></p><p style="margin-right: 0pt; margin-left: 0pt;"><span style="font-size:12pt"><span style="font-family:宋體">在被修理印刷板上找到圖1所示各對應(yīng)點。</span></span></p><p style="margin-right: 0pt; margin-left: 0pt;"><span style="font-size:12pt"><span style="font-family:宋體">1、將一手指觸及(1)，另一手指觸及(11)，此時表頭指針打向一邊，</span></span></p><p style="margin-right: 0pt; margin-left: 0pt;"><span style="font-size:12pt"><span style="font-family:宋體">說明直流正電壓能從(1)輸入，(1)以后所有電路均無問題，而檢修(1)以前的線路是十分簡單的。</span></span></p><p style="margin-right: 0pt; margin-left: 0pt;"><span style="font-size:12pt"><span style="font-family:宋體">2、如果直流信號輸不進，則用交流輸入：將一手指觸及(2)或(3)，另一手指先后觸及(7)和(8)，此時表頭指針應(yīng)分別打向兩邊。如果觸及(7)和(8)，表頭指針向一個方向偏轉(zhuǎn)，而另一方向無指示，則問題在解調(diào)器。表頭指針無指示，則問題在交流放大器和解調(diào)器線路中。</span></span></p><p style="margin-right: 0pt; margin-left: 0pt;"><span style="font-size:12pt"><span style="font-family:宋體">三、電流電壓測量法</span></span></p><p style="margin-right: 0pt; margin-left: 0pt;"><span style="font-size:12pt"><span style="font-family:宋體">用萬用表測量晶體管檢流計總電流約0.8mA（電源電壓在9V時），也可以測量交流放大器的各點工作電壓和振蕩器輸出電壓來判斷。如果測量數(shù)值與典型數(shù)據(jù)偏差太大，說明線路有問題。</span></span></p><p style="margin-right: 0pt; margin-left: 0pt;"><span style="font-size:12pt"><span style="font-family:宋體">四、修理注意事項</span></span></p><p style="margin-right: 0pt; margin-left: 0pt;"><span style="font-size:12pt"><span style="font-family:宋體">1、在修理晶體管檢流計時，可用以上三種方法來確定故障點。</span></span></p><p style="margin-right: 0pt; margin-left: 0pt;"><span style="font-size:12pt"><span style="font-family:宋體">2、在焊接3DO2場效應(yīng)管時，烙鐵應(yīng)很好接地，斷電焊接。</span></span></p><p style="margin-right: 0pt; margin-left: 0pt;"><span style="font-size:12pt"><span style="font-family:宋體">3、在檢查元件時，應(yīng)重點檢查場效應(yīng)管是否損壞，電容器容量誤差無關(guān)緊要，而對電容器漏電要求較高，檢測元件方法請參閱有關(guān)資料。</span></span></p><p style="margin-right: 0pt; margin-left: 0pt;"><span style="font-size:12pt"><span style="font-family:宋體">4、焊接元件時，應(yīng)使用24W烙鐵，并防止印刷板線條短路和翹起。</span></span></p><p style="margin-right: 0pt; margin-left: 0pt;"><span style="font-size:12pt"><span style="font-family:宋體">5、晶體管檢流計原理圖和裝配圖中所標(biāo)晶體管型號僅供參考。</span></span></p><p style="margin-right: 0pt; margin-left: 0pt;"><img alt="" data-bd-imgshare-binded="1" src="http://img56.chem17.com/9/20171115/636463309172970452803.png" style="height:387px; width:532px" /> </p><p style="margin-right: 0pt; margin-left: 0pt;"><span style="font-size:12pt"><span style="font-family:宋體">五、注意事項和維護保養(yǎng)</span></span></p><p style="margin-right: 0pt; margin-left: 0pt;"><span style="font-size:12pt"><span style="font-family:宋體">1、在測電感電路的直流電阻時，應(yīng)先按下“B”按鈕，再按下“G”按鈕，斷開時，應(yīng)先斷開“G”按鈕，后斷開“B”按鈕。</span></span></p><p style="margin-right: 0pt; margin-left: 0pt;"><span style="font-size:12pt"><span style="font-family:宋體">2、測量0.1Ω以下阻值時，“B”按鈕應(yīng)間歇使用。</span></span></p><p style="margin-right: 0pt; margin-left: 0pt;"><span style="font-size:12pt"><span style="font-family:宋體">3、在測量0.1Ω以下阻值時，C</span></span><sub><span style="font-size:12pt"><span style="font-family:宋體">1</span></span></sub><span style="font-size:12pt"><span style="font-family:宋體">、P</span></span><sub><span style="font-size:12pt"><span style="font-family:宋體">1</span></span></sub><span style="font-size:12pt"><span style="font-family:宋體">、P</span></span><sub><span style="font-size:12pt"><span style="font-family:宋體">2</span></span></sub><span style="font-size:12pt"><span style="font-family:宋體">、C</span></span><sub><span style="font-size:12pt"><span style="font-family:宋體">2</span></span></sub><span style="font-size:12pt"><span style="font-family:宋體">、接線柱到被測量電阻之間的連接導(dǎo)線電阻為0.005Ω~0.01Ω；測量其它阻值時，連接導(dǎo)線電阻可不大于0.05Ω。</span></span></p><p style="margin-right: 0pt; margin-left: 0pt;"><span style="font-size:12pt"><span style="font-family:宋體">4、電橋使用完畢后，“B”與“G”按鈕應(yīng)松開。“B</span></span><sub><span style="font-size:12pt"><span style="font-family:宋體">1</span></span></sub><span style="font-size:12pt"><span style="font-family:宋體">”開關(guān)應(yīng)扳向“斷”位置，避免浪費晶體管檢流計放大工作電源。</span></span></p><p style="margin-right: 0pt; margin-left: 0pt;"><span style="font-size:12pt"><span style="font-family:宋體">5、如電橋長期擱置不用，應(yīng)將電池取出。</span></span></p><p style="margin-right: 0pt; margin-left: 0pt;"><span style="font-size:12pt"><span style="font-family:宋體">6、如電橋長期擱置不用，在接觸處可能產(chǎn)生氧化，造成接觸不良，使接觸良好，再涂上一薄層無酸性凡士林，予以保護。</span></span></p><p style="margin-right: 0pt; margin-left: 0pt;"><span style="font-size:12pt"><span style="font-family:宋體">7、電橋應(yīng)貯放在環(huán)境溫度+5℃~+45℃，相對濕度小于30%的條件下，室內(nèi)空氣中不應(yīng)含有能腐蝕儀器的氣體和有害雜質(zhì)。</span></span></p><p style="margin-right: 0pt; margin-left: 0pt;"><span style="font-size:12pt"><span style="font-family:宋體">8、儀器應(yīng)保持清潔，并避免直接曝曬和劇烈震動。</span></span></p><p style="margin-right: 0pt; margin-left: 0pt;"><span style="font-size:12pt"><span style="font-family:宋體">9、儀器在使用中，如發(fā)現(xiàn)檢流計靈敏度顯著下降，可能因電池壽命完畢引起，因更換新的電池。</span></span></p><p style="margin-right: 0pt; margin-left: 0pt;"><span style="font-size:12pt"><span style="font-family:宋體">10、在用戶遵守技術(shù)條件所規(guī)定的使用、運輸及儲藏的條件下，從交貨之日起一年內(nèi)，因制造質(zhì)量不良而發(fā)生損壞或不能正常</span></span></p><p style="margin-right: 0pt; margin-left: 0pt;"><span style="font-size:12pt"><span 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